/*
 *  qemu user main
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include "qemu/osdep.h"
#include "qemu-version.h"
#include <sys/syscall.h>
#include <sys/resource.h>

#include "qapi/error.h"
#include "qemu.h"
#include "qemu/path.h"
#include "qemu/config-file.h"
#include "qemu/cutils.h"
#include "qemu/help_option.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "tcg.h"
#include "qemu/timer.h"
#include "qemu/envlist.h"
#include "elf.h"
#include "exec/log.h"
#include "trace/control.h"
#include "glib-compat.h"

char *exec_path;

int singlestep;
static const char *filename;
static const char *argv0;
static int gdbstub_port;
static envlist_t *envlist;
static const char *cpu_model;
unsigned long mmap_min_addr;
unsigned long guest_base;
int have_guest_base;

#define EXCP_DUMP(env, fmt, ...)                                        \
do {                                                                    \
    CPUState *cs = ENV_GET_CPU(env);                                    \
    fprintf(stderr, fmt , ## __VA_ARGS__);                              \
    cpu_dump_state(cs, stderr, fprintf, 0);                             \
    if (qemu_log_separate()) {                                          \
        qemu_log(fmt, ## __VA_ARGS__);                                  \
        log_cpu_state(cs, 0);                                           \
    }                                                                   \
} while (0)

#if (TARGET_LONG_BITS == 32) && (HOST_LONG_BITS == 64)
/*
 * When running 32-on-64 we should make sure we can fit all of the possible
 * guest address space into a contiguous chunk of virtual host memory.
 *
 * This way we will never overlap with our own libraries or binaries or stack
 * or anything else that QEMU maps.
 */
# ifdef TARGET_MIPS
/* MIPS only supports 31 bits of virtual address space for user space */
unsigned long reserved_va = 0x77000000;
# else
unsigned long reserved_va = 0xf7000000;
# endif
#else
unsigned long reserved_va;
#endif

static void usage(int exitcode);

static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
const char *qemu_uname_release;

/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
   we allocate a bigger stack. Need a better solution, for example
   by remapping the process stack directly at the right place */
unsigned long guest_stack_size = 8 * 1024 * 1024UL;

void gemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

#if defined(TARGET_I386)
int cpu_get_pic_interrupt(CPUX86State *env)
{
    return -1;
}
#endif

/***********************************************************/
/* Helper routines for implementing atomic operations.  */

/* Make sure everything is in a consistent state for calling fork().  */
void fork_start(void)
{
    cpu_list_lock();
    qemu_mutex_lock(&tcg_ctx.tb_ctx.tb_lock);
    mmap_fork_start();
}

void fork_end(int child)
{
    mmap_fork_end(child);
    if (child) {
        CPUState *cpu, *next_cpu;
        /* Child processes created by fork() only have a single thread.
           Discard information about the parent threads.  */
        CPU_FOREACH_SAFE(cpu, next_cpu) {
            if (cpu != thread_cpu) {
                QTAILQ_REMOVE(&cpus, cpu, node);
            }
        }
        qemu_mutex_init(&tcg_ctx.tb_ctx.tb_lock);
        qemu_init_cpu_list();
        gdbserver_fork(thread_cpu);
    } else {
        qemu_mutex_unlock(&tcg_ctx.tb_ctx.tb_lock);
        cpu_list_unlock();
    }
}

#ifdef TARGET_I386
/***********************************************************/
/* CPUX86 core interface */

uint64_t cpu_get_tsc(CPUX86State *env)
{
    return cpu_get_host_ticks();
}

static void write_dt(void *ptr, unsigned long addr, unsigned long limit,
                     int flags)
{
    unsigned int e1, e2;
    uint32_t *p;
    e1 = (addr << 16) | (limit & 0xffff);
    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
    e2 |= flags;
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

static uint64_t *idt_table;
#ifdef TARGET_X86_64
static void set_gate64(void *ptr, unsigned int type, unsigned int dpl,
                       uint64_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
    p[2] = tswap32(addr >> 32);
    p[3] = 0;
}
/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate64(idt_table + n * 2, 0, dpl, 0, 0);
}
#else
static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
                     uint32_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate(idt_table + n, 0, dpl, 0, 0);
}
#endif

void cpu_loop(CPUX86State *env)
{
    CPUState *cs = CPU(x86_env_get_cpu(env));
    int trapnr;
    abi_ulong pc;
    abi_ulong ret;
    target_siginfo_t info;

    for(;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch(trapnr) {
        case 0x80:
            /* linux syscall from int $0x80 */
            ret = do_syscall(env,
                             env->regs[R_EAX],
                             env->regs[R_EBX],
                             env->regs[R_ECX],
                             env->regs[R_EDX],
                             env->regs[R_ESI],
                             env->regs[R_EDI],
                             env->regs[R_EBP],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->eip -= 2;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->regs[R_EAX] = ret;
            }
            break;
#ifndef TARGET_ABI32
        case EXCP_SYSCALL:
            /* linux syscall from syscall instruction */
            ret = do_syscall(env,
                             env->regs[R_EAX],
                             env->regs[R_EDI],
                             env->regs[R_ESI],
                             env->regs[R_EDX],
                             env->regs[10],
                             env->regs[8],
                             env->regs[9],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->eip -= 2;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->regs[R_EAX] = ret;
            }
            break;
#endif
        case EXCP0B_NOSEG:
        case EXCP0C_STACK:
            info.si_signo = TARGET_SIGBUS;
            info.si_errno = 0;
            info.si_code = TARGET_SI_KERNEL;
            info._sifields._sigfault._addr = 0;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP0D_GPF:
            /* XXX: potential problem if ABI32 */
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_fault(env);
            } else
#endif
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SI_KERNEL;
                info._sifields._sigfault._addr = 0;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP0E_PAGE:
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            if (!(env->error_code & 1))
                info.si_code = TARGET_SEGV_MAPERR;
            else
                info.si_code = TARGET_SEGV_ACCERR;
            info._sifields._sigfault._addr = env->cr[2];
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP00_DIVZ:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                /* division by zero */
                info.si_signo = TARGET_SIGFPE;
                info.si_errno = 0;
                info.si_code = TARGET_FPE_INTDIV;
                info._sifields._sigfault._addr = env->eip;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP01_DB:
        case EXCP03_INT3:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                info.si_signo = TARGET_SIGTRAP;
                info.si_errno = 0;
                if (trapnr == EXCP01_DB) {
                    info.si_code = TARGET_TRAP_BRKPT;
                    info._sifields._sigfault._addr = env->eip;
                } else {
                    info.si_code = TARGET_SI_KERNEL;
                    info._sifields._sigfault._addr = 0;
                }
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP04_INTO:
        case EXCP05_BOUND:
#ifndef TARGET_X86_64
            if (env->eflags & VM_MASK) {
                handle_vm86_trap(env, trapnr);
            } else
#endif
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SI_KERNEL;
                info._sifields._sigfault._addr = 0;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP06_ILLOP:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPN;
            info._sifields._sigfault._addr = env->eip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            pc = env->segs[R_CS].base + env->eip;
            EXCP_DUMP(env, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
                      (long)pc, trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_ARM

#define get_user_code_u32(x, gaddr, env)                \
    ({ abi_long __r = get_user_u32((x), (gaddr));       \
        if (!__r && bswap_code(arm_sctlr_b(env))) {     \
            (x) = bswap32(x);                           \
        }                                               \
        __r;                                            \
    })

#define get_user_code_u16(x, gaddr, env)                \
    ({ abi_long __r = get_user_u16((x), (gaddr));       \
        if (!__r && bswap_code(arm_sctlr_b(env))) {     \
            (x) = bswap16(x);                           \
        }                                               \
        __r;                                            \
    })

#define get_user_data_u32(x, gaddr, env)                \
    ({ abi_long __r = get_user_u32((x), (gaddr));       \
        if (!__r && arm_cpu_bswap_data(env)) {          \
            (x) = bswap32(x);                           \
        }                                               \
        __r;                                            \
    })

#define get_user_data_u16(x, gaddr, env)                \
    ({ abi_long __r = get_user_u16((x), (gaddr));       \
        if (!__r && arm_cpu_bswap_data(env)) {          \
            (x) = bswap16(x);                           \
        }                                               \
        __r;                                            \
    })

#define put_user_data_u32(x, gaddr, env)                \
    ({ typeof(x) __x = (x);                             \
        if (arm_cpu_bswap_data(env)) {                  \
            __x = bswap32(__x);                         \
        }                                               \
        put_user_u32(__x, (gaddr));                     \
    })

#define put_user_data_u16(x, gaddr, env)                \
    ({ typeof(x) __x = (x);                             \
        if (arm_cpu_bswap_data(env)) {                  \
            __x = bswap16(__x);                         \
        }                                               \
        put_user_u16(__x, (gaddr));                     \
    })

#ifdef TARGET_ABI32
/* Commpage handling -- there is no commpage for AArch64 */

/*
 * See the Linux kernel's Documentation/arm/kernel_user_helpers.txt
 * Input:
 * r0 = pointer to oldval
 * r1 = pointer to newval
 * r2 = pointer to target value
 *
 * Output:
 * r0 = 0 if *ptr was changed, non-0 if no exchange happened
 * C set if *ptr was changed, clear if no exchange happened
 *
 * Note segv's in kernel helpers are a bit tricky, we can set the
 * data address sensibly but the PC address is just the entry point.
 */
static void arm_kernel_cmpxchg64_helper(CPUARMState *env)
{
    uint64_t oldval, newval, val;
    uint32_t addr, cpsr;
    target_siginfo_t info;

    /* Based on the 32 bit code in do_kernel_trap */

    /* XXX: This only works between threads, not between processes.
       It's probably possible to implement this with native host
       operations. However things like ldrex/strex are much harder so
       there's not much point trying.  */
    start_exclusive();
    cpsr = cpsr_read(env);
    addr = env->regs[2];

    if (get_user_u64(oldval, env->regs[0])) {
        env->exception.vaddress = env->regs[0];
        goto segv;
    };

    if (get_user_u64(newval, env->regs[1])) {
        env->exception.vaddress = env->regs[1];
        goto segv;
    };

    if (get_user_u64(val, addr)) {
        env->exception.vaddress = addr;
        goto segv;
    }

    if (val == oldval) {
        val = newval;

        if (put_user_u64(val, addr)) {
            env->exception.vaddress = addr;
            goto segv;
        };

        env->regs[0] = 0;
        cpsr |= CPSR_C;
    } else {
        env->regs[0] = -1;
        cpsr &= ~CPSR_C;
    }
    cpsr_write(env, cpsr, CPSR_C, CPSRWriteByInstr);
    end_exclusive();
    return;

segv:
    end_exclusive();
    /* We get the PC of the entry address - which is as good as anything,
       on a real kernel what you get depends on which mode it uses. */
    info.si_signo = TARGET_SIGSEGV;
    info.si_errno = 0;
    /* XXX: check env->error_code */
    info.si_code = TARGET_SEGV_MAPERR;
    info._sifields._sigfault._addr = env->exception.vaddress;
    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
}

/* Handle a jump to the kernel code page.  */
static int
do_kernel_trap(CPUARMState *env)
{
    uint32_t addr;
    uint32_t cpsr;
    uint32_t val;

    switch (env->regs[15]) {
    case 0xffff0fa0: /* __kernel_memory_barrier */
        /* ??? No-op. Will need to do better for SMP.  */
        break;
    case 0xffff0fc0: /* __kernel_cmpxchg */
         /* XXX: This only works between threads, not between processes.
            It's probably possible to implement this with native host
            operations. However things like ldrex/strex are much harder so
            there's not much point trying.  */
        start_exclusive();
        cpsr = cpsr_read(env);
        addr = env->regs[2];
        /* FIXME: This should SEGV if the access fails.  */
        if (get_user_u32(val, addr))
            val = ~env->regs[0];
        if (val == env->regs[0]) {
            val = env->regs[1];
            /* FIXME: Check for segfaults.  */
            put_user_u32(val, addr);
            env->regs[0] = 0;
            cpsr |= CPSR_C;
        } else {
            env->regs[0] = -1;
            cpsr &= ~CPSR_C;
        }
        cpsr_write(env, cpsr, CPSR_C, CPSRWriteByInstr);
        end_exclusive();
        break;
    case 0xffff0fe0: /* __kernel_get_tls */
        env->regs[0] = cpu_get_tls(env);
        break;
    case 0xffff0f60: /* __kernel_cmpxchg64 */
        arm_kernel_cmpxchg64_helper(env);
        break;

    default:
        return 1;
    }
    /* Jump back to the caller.  */
    addr = env->regs[14];
    if (addr & 1) {
        env->thumb = 1;
        addr &= ~1;
    }
    env->regs[15] = addr;

    return 0;
}

void cpu_loop(CPUARMState *env)
{
    CPUState *cs = CPU(arm_env_get_cpu(env));
    int trapnr;
    unsigned int n, insn;
    target_siginfo_t info;
    uint32_t addr;
    abi_ulong ret;

    for(;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch(trapnr) {
        case EXCP_UDEF:
            {
                TaskState *ts = cs->opaque;
                uint32_t opcode;
                int rc;

                /* we handle the FPU emulation here, as Linux */
                /* we get the opcode */
                /* FIXME - what to do if get_user() fails? */
                get_user_code_u32(opcode, env->regs[15], env);

                rc = EmulateAll(opcode, &ts->fpa, env);
                if (rc == 0) { /* illegal instruction */
                    info.si_signo = TARGET_SIGILL;
                    info.si_errno = 0;
                    info.si_code = TARGET_ILL_ILLOPN;
                    info._sifields._sigfault._addr = env->regs[15];
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                } else if (rc < 0) { /* FP exception */
                    int arm_fpe=0;

                    /* translate softfloat flags to FPSR flags */
                    if (-rc & float_flag_invalid)
                      arm_fpe |= BIT_IOC;
                    if (-rc & float_flag_divbyzero)
                      arm_fpe |= BIT_DZC;
                    if (-rc & float_flag_overflow)
                      arm_fpe |= BIT_OFC;
                    if (-rc & float_flag_underflow)
                      arm_fpe |= BIT_UFC;
                    if (-rc & float_flag_inexact)
                      arm_fpe |= BIT_IXC;

                    FPSR fpsr = ts->fpa.fpsr;
                    //printf("fpsr 0x%x, arm_fpe 0x%x\n",fpsr,arm_fpe);

                    if (fpsr & (arm_fpe << 16)) { /* exception enabled? */
                      info.si_signo = TARGET_SIGFPE;
                      info.si_errno = 0;

                      /* ordered by priority, least first */
                      if (arm_fpe & BIT_IXC) info.si_code = TARGET_FPE_FLTRES;
                      if (arm_fpe & BIT_UFC) info.si_code = TARGET_FPE_FLTUND;
                      if (arm_fpe & BIT_OFC) info.si_code = TARGET_FPE_FLTOVF;
                      if (arm_fpe & BIT_DZC) info.si_code = TARGET_FPE_FLTDIV;
                      if (arm_fpe & BIT_IOC) info.si_code = TARGET_FPE_FLTINV;

                      info._sifields._sigfault._addr = env->regs[15];
                      queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                    } else {
                      env->regs[15] += 4;
                    }

                    /* accumulate unenabled exceptions */
                    if ((!(fpsr & BIT_IXE)) && (arm_fpe & BIT_IXC))
                      fpsr |= BIT_IXC;
                    if ((!(fpsr & BIT_UFE)) && (arm_fpe & BIT_UFC))
                      fpsr |= BIT_UFC;
                    if ((!(fpsr & BIT_OFE)) && (arm_fpe & BIT_OFC))
                      fpsr |= BIT_OFC;
                    if ((!(fpsr & BIT_DZE)) && (arm_fpe & BIT_DZC))
                      fpsr |= BIT_DZC;
                    if ((!(fpsr & BIT_IOE)) && (arm_fpe & BIT_IOC))
                      fpsr |= BIT_IOC;
                    ts->fpa.fpsr=fpsr;
                } else { /* everything OK */
                    /* increment PC */
                    env->regs[15] += 4;
                }
            }
            break;
        case EXCP_SWI:
        case EXCP_BKPT:
            {
                env->eabi = 1;
                /* system call */
                if (trapnr == EXCP_BKPT) {
                    if (env->thumb) {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_code_u16(insn, env->regs[15], env);
                        n = insn & 0xff;
                        env->regs[15] += 2;
                    } else {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_code_u32(insn, env->regs[15], env);
                        n = (insn & 0xf) | ((insn >> 4) & 0xff0);
                        env->regs[15] += 4;
                    }
                } else {
                    if (env->thumb) {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_code_u16(insn, env->regs[15] - 2, env);
                        n = insn & 0xff;
                    } else {
                        /* FIXME - what to do if get_user() fails? */
                        get_user_code_u32(insn, env->regs[15] - 4, env);
                        n = insn & 0xffffff;
                    }
                }

                if (n == ARM_NR_cacheflush) {
                    /* nop */
                } else if (n == ARM_NR_semihosting
                           || n == ARM_NR_thumb_semihosting) {
                    env->regs[0] = do_arm_semihosting (env);
                } else if (n == 0 || n >= ARM_SYSCALL_BASE || env->thumb) {
                    /* linux syscall */
                    if (env->thumb || n == 0) {
                        n = env->regs[7];
                    } else {
                        n -= ARM_SYSCALL_BASE;
                        env->eabi = 0;
                    }
                    if ( n > ARM_NR_BASE) {
                        switch (n) {
                        case ARM_NR_cacheflush:
                            /* nop */
                            break;
                        case ARM_NR_set_tls:
                            cpu_set_tls(env, env->regs[0]);
                            env->regs[0] = 0;
                            break;
                        case ARM_NR_breakpoint:
                            env->regs[15] -= env->thumb ? 2 : 4;
                            goto excp_debug;
                        default:
                            gemu_log("qemu: Unsupported ARM syscall: 0x%x\n",
                                     n);
                            env->regs[0] = -TARGET_ENOSYS;
                            break;
                        }
                    } else {
                        ret = do_syscall(env,
                                         n,
                                         env->regs[0],
                                         env->regs[1],
                                         env->regs[2],
                                         env->regs[3],
                                         env->regs[4],
                                         env->regs[5],
                                         0, 0);
                        if (ret == -TARGET_ERESTARTSYS) {
                            env->regs[15] -= env->thumb ? 2 : 4;
                        } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                            env->regs[0] = ret;
                        }
                    }
                } else {
                    goto error;
                }
            }
            break;
        case EXCP_SEMIHOST:
            env->regs[0] = do_arm_semihosting(env);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_PREFETCH_ABORT:
        case EXCP_DATA_ABORT:
            addr = env->exception.vaddress;
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = addr;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_DEBUG:
        excp_debug:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_KERNEL_TRAP:
            if (do_kernel_trap(env))
              goto error;
            break;
        case EXCP_YIELD:
            /* nothing to do here for user-mode, just resume guest code */
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
        error:
            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}

#else

/* AArch64 main loop */
void cpu_loop(CPUARMState *env)
{
    CPUState *cs = CPU(arm_env_get_cpu(env));
    int trapnr, sig;
    abi_long ret;
    target_siginfo_t info;

    for (;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case EXCP_SWI:
            ret = do_syscall(env,
                             env->xregs[8],
                             env->xregs[0],
                             env->xregs[1],
                             env->xregs[2],
                             env->xregs[3],
                             env->xregs[4],
                             env->xregs[5],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->pc -= 4;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->xregs[0] = ret;
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_UDEF:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPN;
            info._sifields._sigfault._addr = env->pc;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_PREFETCH_ABORT:
        case EXCP_DATA_ABORT:
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            /* XXX: check env->error_code */
            info.si_code = TARGET_SEGV_MAPERR;
            info._sifields._sigfault._addr = env->exception.vaddress;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_DEBUG:
        case EXCP_BKPT:
            sig = gdb_handlesig(cs, TARGET_SIGTRAP);
            if (sig) {
                info.si_signo = sig;
                info.si_errno = 0;
                info.si_code = TARGET_TRAP_BRKPT;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_SEMIHOST:
            env->xregs[0] = do_arm_semihosting(env);
            break;
        case EXCP_YIELD:
            /* nothing to do here for user-mode, just resume guest code */
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
            abort();
        }
        process_pending_signals(env);
        /* Exception return on AArch64 always clears the exclusive monitor,
         * so any return to running guest code implies this.
         */
        env->exclusive_addr = -1;
    }
}
#endif /* ndef TARGET_ABI32 */

#endif

#ifdef TARGET_UNICORE32

void cpu_loop(CPUUniCore32State *env)
{
    CPUState *cs = CPU(uc32_env_get_cpu(env));
    int trapnr;
    unsigned int n, insn;
    target_siginfo_t info;

    for (;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case UC32_EXCP_PRIV:
            {
                /* system call */
                get_user_u32(insn, env->regs[31] - 4);
                n = insn & 0xffffff;

                if (n >= UC32_SYSCALL_BASE) {
                    /* linux syscall */
                    n -= UC32_SYSCALL_BASE;
                    if (n == UC32_SYSCALL_NR_set_tls) {
                            cpu_set_tls(env, env->regs[0]);
                            env->regs[0] = 0;
                    } else {
                        abi_long ret = do_syscall(env,
                                                  n,
                                                  env->regs[0],
                                                  env->regs[1],
                                                  env->regs[2],
                                                  env->regs[3],
                                                  env->regs[4],
                                                  env->regs[5],
                                                  0, 0);
                        if (ret == -TARGET_ERESTARTSYS) {
                            env->regs[31] -= 4;
                        } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                            env->regs[0] = ret;
                        }
                    }
                } else {
                    goto error;
                }
            }
            break;
        case UC32_EXCP_DTRAP:
        case UC32_EXCP_ITRAP:
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            /* XXX: check env->error_code */
            info.si_code = TARGET_SEGV_MAPERR;
            info._sifields._sigfault._addr = env->cp0.c4_faultaddr;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig) {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            goto error;
        }
        process_pending_signals(env);
    }

error:
    EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
    abort();
}
#endif

#ifdef TARGET_SPARC
#define SPARC64_STACK_BIAS 2047

//#define DEBUG_WIN

/* WARNING: dealing with register windows _is_ complicated. More info
   can be found at http://www.sics.se/~psm/sparcstack.html */
static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
{
    index = (index + cwp * 16) % (16 * env->nwindows);
    /* wrap handling : if cwp is on the last window, then we use the
       registers 'after' the end */
    if (index < 8 && env->cwp == env->nwindows - 1)
        index += 16 * env->nwindows;
    return index;
}

/* save the register window 'cwp1' */
static inline void save_window_offset(CPUSPARCState *env, int cwp1)
{
    unsigned int i;
    abi_ulong sp_ptr;

    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if put_user() fails? */
        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
}

static void save_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->wim = new_wim;
#else
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->cansave++;

    env->canrestore--;
#endif
}

static void restore_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
#endif
    unsigned int i, cwp1;
    abi_ulong sp_ptr;

#ifndef TARGET_SPARC64
    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
#endif

    /* restore the invalid window */
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if get_user() fails? */
        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
#ifdef TARGET_SPARC64
    env->canrestore++;
    if (env->cleanwin < env->nwindows - 1)
        env->cleanwin++;
    env->cansave--;
#else
    env->wim = new_wim;
#endif
}

static void flush_windows(CPUSPARCState *env)
{
    int offset, cwp1;

    offset = 1;
    for(;;) {
        /* if restore would invoke restore_window(), then we can stop */
        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
#ifndef TARGET_SPARC64
        if (env->wim & (1 << cwp1))
            break;
#else
        if (env->canrestore == 0)
            break;
        env->cansave++;
        env->canrestore--;
#endif
        save_window_offset(env, cwp1);
        offset++;
    }
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
#ifndef TARGET_SPARC64
    /* set wim so that restore will reload the registers */
    env->wim = 1 << cwp1;
#endif
#if defined(DEBUG_WIN)
    printf("flush_windows: nb=%d\n", offset - 1);
#endif
}

void cpu_loop (CPUSPARCState *env)
{
    CPUState *cs = CPU(sparc_env_get_cpu(env));
    int trapnr;
    abi_long ret;
    target_siginfo_t info;

    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        /* Compute PSR before exposing state.  */
        if (env->cc_op != CC_OP_FLAGS) {
            cpu_get_psr(env);
        }

        switch (trapnr) {
#ifndef TARGET_SPARC64
        case 0x88:
        case 0x90:
#else
        case 0x110:
        case 0x16d:
#endif
            ret = do_syscall (env, env->gregs[1],
                              env->regwptr[0], env->regwptr[1],
                              env->regwptr[2], env->regwptr[3],
                              env->regwptr[4], env->regwptr[5],
                              0, 0);
            if (ret == -TARGET_ERESTARTSYS || ret == -TARGET_QEMU_ESIGRETURN) {
                break;
            }
            if ((abi_ulong)ret >= (abi_ulong)(-515)) {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc |= PSR_CARRY;
#else
                env->psr |= PSR_CARRY;
#endif
                ret = -ret;
            } else {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc &= ~PSR_CARRY;
#else
                env->psr &= ~PSR_CARRY;
#endif
            }
            env->regwptr[0] = ret;
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
        case 0x83: /* flush windows */
#ifdef TARGET_ABI32
        case 0x103:
#endif
            flush_windows(env);
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
#ifndef TARGET_SPARC64
        case TT_WIN_OVF: /* window overflow */
            save_window(env);
            break;
        case TT_WIN_UNF: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->mmuregs[4];
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
#else
        case TT_SPILL: /* window overflow */
            save_window(env);
            break;
        case TT_FILL: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                if (trapnr == TT_DFAULT)
                    info._sifields._sigfault._addr = env->dmmuregs[4];
                else
                    info._sifields._sigfault._addr = cpu_tsptr(env)->tpc;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
#ifndef TARGET_ABI32
        case 0x16e:
            flush_windows(env);
            sparc64_get_context(env);
            break;
        case 0x16f:
            flush_windows(env);
            sparc64_set_context(env);
            break;
#endif
#endif
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case TT_ILL_INSN:
            {
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                info.si_code = TARGET_ILL_ILLOPC;
                info._sifields._sigfault._addr = env->pc;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, fprintf, 0);
            exit(EXIT_FAILURE);
        }
        process_pending_signals (env);
    }
}

#endif

#ifdef TARGET_PPC
static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
{
    return cpu_get_host_ticks();
}

uint64_t cpu_ppc_load_tbl(CPUPPCState *env)
{
    return cpu_ppc_get_tb(env);
}

uint32_t cpu_ppc_load_tbu(CPUPPCState *env)
{
    return cpu_ppc_get_tb(env) >> 32;
}

uint64_t cpu_ppc_load_atbl(CPUPPCState *env)
{
    return cpu_ppc_get_tb(env);
}

uint32_t cpu_ppc_load_atbu(CPUPPCState *env)
{
    return cpu_ppc_get_tb(env) >> 32;
}

uint32_t cpu_ppc601_load_rtcu(CPUPPCState *env)
__attribute__ (( alias ("cpu_ppc_load_tbu") ));

uint32_t cpu_ppc601_load_rtcl(CPUPPCState *env)
{
    return cpu_ppc_load_tbl(env) & 0x3FFFFF80;
}

/* XXX: to be fixed */
int ppc_dcr_read (ppc_dcr_t *dcr_env, int dcrn, uint32_t *valp)
{
    return -1;
}

int ppc_dcr_write (ppc_dcr_t *dcr_env, int dcrn, uint32_t val)
{
    return -1;
}

static int do_store_exclusive(CPUPPCState *env)
{
    target_ulong addr;
    target_ulong page_addr;
    target_ulong val, val2 __attribute__((unused)) = 0;
    int flags;
    int segv = 0;

    addr = env->reserve_ea;
    page_addr = addr & TARGET_PAGE_MASK;
    start_exclusive();
    mmap_lock();
    flags = page_get_flags(page_addr);
    if ((flags & PAGE_READ) == 0) {
        segv = 1;
    } else {
        int reg = env->reserve_info & 0x1f;
        int size = env->reserve_info >> 5;
        int stored = 0;

        if (addr == env->reserve_addr) {
            switch (size) {
            case 1: segv = get_user_u8(val, addr); break;
            case 2: segv = get_user_u16(val, addr); break;
            case 4: segv = get_user_u32(val, addr); break;
#if defined(TARGET_PPC64)
            case 8: segv = get_user_u64(val, addr); break;
            case 16: {
                segv = get_user_u64(val, addr);
                if (!segv) {
                    segv = get_user_u64(val2, addr + 8);
                }
                break;
            }
#endif
            default: abort();
            }
            if (!segv && val == env->reserve_val) {
                val = env->gpr[reg];
                switch (size) {
                case 1: segv = put_user_u8(val, addr); break;
                case 2: segv = put_user_u16(val, addr); break;
                case 4: segv = put_user_u32(val, addr); break;
#if defined(TARGET_PPC64)
                case 8: segv = put_user_u64(val, addr); break;
                case 16: {
                    if (val2 == env->reserve_val2) {
                        if (msr_le) {
                            val2 = val;
                            val = env->gpr[reg+1];
                        } else {
                            val2 = env->gpr[reg+1];
                        }
                        segv = put_user_u64(val, addr);
                        if (!segv) {
                            segv = put_user_u64(val2, addr + 8);
                        }
                    }
                    break;
                }
#endif
                default: abort();
                }
                if (!segv) {
                    stored = 1;
                }
            }
        }
        env->crf[0] = (stored << 1) | xer_so;
        env->reserve_addr = (target_ulong)-1;
    }
    if (!segv) {
        env->nip += 4;
    }
    mmap_unlock();
    end_exclusive();
    return segv;
}

void cpu_loop(CPUPPCState *env)
{
    CPUState *cs = CPU(ppc_env_get_cpu(env));
    target_siginfo_t info;
    int trapnr;
    target_ulong ret;

    for(;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch(trapnr) {
        case POWERPC_EXCP_NONE:
            /* Just go on */
            break;
        case POWERPC_EXCP_CRITICAL: /* Critical input                        */
            cpu_abort(cs, "Critical interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_MCHECK:   /* Machine check exception               */
            cpu_abort(cs, "Machine check exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DSI:      /* Data storage exception                */
            /* XXX: check this. Seems bugged */
            switch (env->error_code & 0xFF000000) {
            case 0x40000000:
            case 0x42000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            case 0x04000000:
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                info.si_code = TARGET_ILL_ILLADR;
                break;
            case 0x08000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_ACCERR;
                break;
            default:
                /* Let's send a regular segfault... */
                EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
                          env->error_code);
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            }
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_ISI:      /* Instruction storage exception         */
            /* XXX: check this */
            switch (env->error_code & 0xFF000000) {
            case 0x40000000:
                info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            case 0x10000000:
            case 0x08000000:
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_ACCERR;
                break;
            default:
                /* Let's send a regular segfault... */
                EXCP_DUMP(env, "Invalid segfault errno (%02x)\n",
                          env->error_code);
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                break;
            }
            info._sifields._sigfault._addr = env->nip - 4;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_EXTERNAL: /* External input                        */
            cpu_abort(cs, "External interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ALIGN:    /* Alignment exception                   */
            /* XXX: check this */
            info.si_signo = TARGET_SIGBUS;
            info.si_errno = 0;
            info.si_code = TARGET_BUS_ADRALN;
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_PROGRAM:  /* Program exception                     */
        case POWERPC_EXCP_HV_EMU:   /* HV emulation                          */
            /* XXX: check this */
            switch (env->error_code & ~0xF) {
            case POWERPC_EXCP_FP:
                info.si_signo = TARGET_SIGFPE;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_FP_OX:
                    info.si_code = TARGET_FPE_FLTOVF;
                    break;
                case POWERPC_EXCP_FP_UX:
                    info.si_code = TARGET_FPE_FLTUND;
                    break;
                case POWERPC_EXCP_FP_ZX:
                case POWERPC_EXCP_FP_VXZDZ:
                    info.si_code = TARGET_FPE_FLTDIV;
                    break;
                case POWERPC_EXCP_FP_XX:
                    info.si_code = TARGET_FPE_FLTRES;
                    break;
                case POWERPC_EXCP_FP_VXSOFT:
                    info.si_code = TARGET_FPE_FLTINV;
                    break;
                case POWERPC_EXCP_FP_VXSNAN:
                case POWERPC_EXCP_FP_VXISI:
                case POWERPC_EXCP_FP_VXIDI:
                case POWERPC_EXCP_FP_VXIMZ:
                case POWERPC_EXCP_FP_VXVC:
                case POWERPC_EXCP_FP_VXSQRT:
                case POWERPC_EXCP_FP_VXCVI:
                    info.si_code = TARGET_FPE_FLTSUB;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown floating point exception (%02x)\n",
                              env->error_code);
                    break;
                }
                break;
            case POWERPC_EXCP_INVAL:
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_INVAL_INVAL:
                    info.si_code = TARGET_ILL_ILLOPC;
                    break;
                case POWERPC_EXCP_INVAL_LSWX:
                    info.si_code = TARGET_ILL_ILLOPN;
                    break;
                case POWERPC_EXCP_INVAL_SPR:
                    info.si_code = TARGET_ILL_PRVREG;
                    break;
                case POWERPC_EXCP_INVAL_FP:
                    info.si_code = TARGET_ILL_COPROC;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown invalid operation (%02x)\n",
                              env->error_code & 0xF);
                    info.si_code = TARGET_ILL_ILLADR;
                    break;
                }
                break;
            case POWERPC_EXCP_PRIV:
                info.si_signo = TARGET_SIGILL;
                info.si_errno = 0;
                switch (env->error_code & 0xF) {
                case POWERPC_EXCP_PRIV_OPC:
                    info.si_code = TARGET_ILL_PRVOPC;
                    break;
                case POWERPC_EXCP_PRIV_REG:
                    info.si_code = TARGET_ILL_PRVREG;
                    break;
                default:
                    EXCP_DUMP(env, "Unknown privilege violation (%02x)\n",
                              env->error_code & 0xF);
                    info.si_code = TARGET_ILL_PRVOPC;
                    break;
                }
                break;
            case POWERPC_EXCP_TRAP:
                cpu_abort(cs, "Tried to call a TRAP\n");
                break;
            default:
                /* Should not happen ! */
                cpu_abort(cs, "Unknown program exception (%02x)\n",
                          env->error_code);
                break;
            }
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_FPU:      /* Floating-point unavailable exception  */
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_SYSCALL:  /* System call exception                 */
            cpu_abort(cs, "Syscall exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_APU:      /* Auxiliary processor unavailable       */
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_DECR:     /* Decrementer exception                 */
            cpu_abort(cs, "Decrementer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_FIT:      /* Fixed-interval timer interrupt        */
            cpu_abort(cs, "Fix interval timer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_WDT:      /* Watchdog timer interrupt              */
            cpu_abort(cs, "Watchdog timer interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DTLB:     /* Data TLB error                        */
            cpu_abort(cs, "Data TLB exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ITLB:     /* Instruction TLB error                 */
            cpu_abort(cs, "Instruction TLB exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_SPEU:     /* SPE/embedded floating-point unavail.  */
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_EFPDI:    /* Embedded floating-point data IRQ      */
            cpu_abort(cs, "Embedded floating-point data IRQ not handled\n");
            break;
        case POWERPC_EXCP_EFPRI:    /* Embedded floating-point round IRQ     */
            cpu_abort(cs, "Embedded floating-point round IRQ not handled\n");
            break;
        case POWERPC_EXCP_EPERFM:   /* Embedded performance monitor IRQ      */
            cpu_abort(cs, "Performance monitor exception not handled\n");
            break;
        case POWERPC_EXCP_DOORI:    /* Embedded doorbell interrupt           */
            cpu_abort(cs, "Doorbell interrupt while in user mode. "
                       "Aborting\n");
            break;
        case POWERPC_EXCP_DOORCI:   /* Embedded doorbell critical interrupt  */
            cpu_abort(cs, "Doorbell critical interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_RESET:    /* System reset exception                */
            cpu_abort(cs, "Reset interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_DSEG:     /* Data segment exception                */
            cpu_abort(cs, "Data segment exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_ISEG:     /* Instruction segment exception         */
            cpu_abort(cs, "Instruction segment exception "
                      "while in user mode. Aborting\n");
            break;
        /* PowerPC 64 with hypervisor mode support */
        case POWERPC_EXCP_HDECR:    /* Hypervisor decrementer exception      */
            cpu_abort(cs, "Hypervisor decrementer interrupt "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_TRACE:    /* Trace exception                       */
            /* Nothing to do:
             * we use this exception to emulate step-by-step execution mode.
             */
            break;
        /* PowerPC 64 with hypervisor mode support */
        case POWERPC_EXCP_HDSI:     /* Hypervisor data storage exception     */
            cpu_abort(cs, "Hypervisor data storage exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HISI:     /* Hypervisor instruction storage excp   */
            cpu_abort(cs, "Hypervisor instruction storage exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HDSEG:    /* Hypervisor data segment exception     */
            cpu_abort(cs, "Hypervisor data segment exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_HISEG:    /* Hypervisor instruction segment excp   */
            cpu_abort(cs, "Hypervisor instruction segment exception "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_VPU:      /* Vector unavailable exception          */
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_COPROC;
            info._sifields._sigfault._addr = env->nip;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case POWERPC_EXCP_PIT:      /* Programmable interval timer IRQ       */
            cpu_abort(cs, "Programmable interval timer interrupt "
                      "while in user mode. Aborting\n");
            break;
        case POWERPC_EXCP_IO:       /* IO error exception                    */
            cpu_abort(cs, "IO error exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_RUNM:     /* Run mode exception                    */
            cpu_abort(cs, "Run mode exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_EMUL:     /* Emulation trap exception              */
            cpu_abort(cs, "Emulation trap exception not handled\n");
            break;
        case POWERPC_EXCP_IFTLB:    /* Instruction fetch TLB error           */
            cpu_abort(cs, "Instruction fetch TLB exception "
                      "while in user-mode. Aborting");
            break;
        case POWERPC_EXCP_DLTLB:    /* Data load TLB miss                    */
            cpu_abort(cs, "Data load TLB exception while in user-mode. "
                      "Aborting");
            break;
        case POWERPC_EXCP_DSTLB:    /* Data store TLB miss                   */
            cpu_abort(cs, "Data store TLB exception while in user-mode. "
                      "Aborting");
            break;
        case POWERPC_EXCP_FPA:      /* Floating-point assist exception       */
            cpu_abort(cs, "Floating-point assist exception not handled\n");
            break;
        case POWERPC_EXCP_IABR:     /* Instruction address breakpoint        */
            cpu_abort(cs, "Instruction address breakpoint exception "
                      "not handled\n");
            break;
        case POWERPC_EXCP_SMI:      /* System management interrupt           */
            cpu_abort(cs, "System management interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_THERM:    /* Thermal interrupt                     */
            cpu_abort(cs, "Thermal interrupt interrupt while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_PERFM:   /* Embedded performance monitor IRQ      */
            cpu_abort(cs, "Performance monitor exception not handled\n");
            break;
        case POWERPC_EXCP_VPUA:     /* Vector assist exception               */
            cpu_abort(cs, "Vector assist exception not handled\n");
            break;
        case POWERPC_EXCP_SOFTP:    /* Soft patch exception                  */
            cpu_abort(cs, "Soft patch exception not handled\n");
            break;
        case POWERPC_EXCP_MAINT:    /* Maintenance exception                 */
            cpu_abort(cs, "Maintenance exception while in user mode. "
                      "Aborting\n");
            break;
        case POWERPC_EXCP_STOP:     /* stop translation                      */
            /* We did invalidate the instruction cache. Go on */
            break;
        case POWERPC_EXCP_BRANCH:   /* branch instruction:                   */
            /* We just stopped because of a branch. Go on */
            break;
        case POWERPC_EXCP_SYSCALL_USER:
            /* system call in user-mode emulation */
            /* WARNING:
             * PPC ABI uses overflow flag in cr0 to signal an error
             * in syscalls.
             */
            env->crf[0] &= ~0x1;
            env->nip += 4;
            ret = do_syscall(env, env->gpr[0], env->gpr[3], env->gpr[4],
                             env->gpr[5], env->gpr[6], env->gpr[7],
                             env->gpr[8], 0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->nip -= 4;
                break;
            }
            if (ret == (target_ulong)(-TARGET_QEMU_ESIGRETURN)) {
                /* Returning from a successful sigreturn syscall.
                   Avoid corrupting register state.  */
                break;
            }
            if (ret > (target_ulong)(-515)) {
                env->crf[0] |= 0x1;
                ret = -ret;
            }
            env->gpr[3] = ret;
            break;
        case POWERPC_EXCP_STCX:
            if (do_store_exclusive(env)) {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->nip;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig) {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            cpu_abort(cs, "Unknown exception 0x%x. Aborting\n", trapnr);
            break;
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_MIPS

# ifdef TARGET_ABI_MIPSO32
#  define MIPS_SYS(name, args) args,
static const uint8_t mips_syscall_args[] = {
        MIPS_SYS(sys_syscall    , 8)    /* 4000 */
        MIPS_SYS(sys_exit       , 1)
        MIPS_SYS(sys_fork       , 0)
        MIPS_SYS(sys_read       , 3)
        MIPS_SYS(sys_write      , 3)
        MIPS_SYS(sys_open       , 3)    /* 4005 */
        MIPS_SYS(sys_close      , 1)
        MIPS_SYS(sys_waitpid    , 3)
        MIPS_SYS(sys_creat      , 2)
        MIPS_SYS(sys_link       , 2)
        MIPS_SYS(sys_unlink     , 1)    /* 4010 */
        MIPS_SYS(sys_execve     , 0)
        MIPS_SYS(sys_chdir      , 1)
        MIPS_SYS(sys_time       , 1)
        MIPS_SYS(sys_mknod      , 3)
        MIPS_SYS(sys_chmod      , 2)    /* 4015 */
        MIPS_SYS(sys_lchown     , 3)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_stat */
        MIPS_SYS(sys_lseek      , 3)
        MIPS_SYS(sys_getpid     , 0)    /* 4020 */
        MIPS_SYS(sys_mount      , 5)
        MIPS_SYS(sys_umount     , 1)
        MIPS_SYS(sys_setuid     , 1)
        MIPS_SYS(sys_getuid     , 0)
        MIPS_SYS(sys_stime      , 1)    /* 4025 */
        MIPS_SYS(sys_ptrace     , 4)
        MIPS_SYS(sys_alarm      , 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_fstat */
        MIPS_SYS(sys_pause      , 0)
        MIPS_SYS(sys_utime      , 2)    /* 4030 */
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_access     , 2)
        MIPS_SYS(sys_nice       , 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* 4035 */
        MIPS_SYS(sys_sync       , 0)
        MIPS_SYS(sys_kill       , 2)
        MIPS_SYS(sys_rename     , 2)
        MIPS_SYS(sys_mkdir      , 2)
        MIPS_SYS(sys_rmdir      , 1)    /* 4040 */
        MIPS_SYS(sys_dup                , 1)
        MIPS_SYS(sys_pipe       , 0)
        MIPS_SYS(sys_times      , 1)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_brk                , 1)    /* 4045 */
        MIPS_SYS(sys_setgid     , 1)
        MIPS_SYS(sys_getgid     , 0)
        MIPS_SYS(sys_ni_syscall , 0)    /* was signal(2) */
        MIPS_SYS(sys_geteuid    , 0)
        MIPS_SYS(sys_getegid    , 0)    /* 4050 */
        MIPS_SYS(sys_acct       , 0)
        MIPS_SYS(sys_umount2    , 2)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_ioctl      , 3)
        MIPS_SYS(sys_fcntl      , 3)    /* 4055 */
        MIPS_SYS(sys_ni_syscall , 2)
        MIPS_SYS(sys_setpgid    , 2)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_olduname   , 1)
        MIPS_SYS(sys_umask      , 1)    /* 4060 */
        MIPS_SYS(sys_chroot     , 1)
        MIPS_SYS(sys_ustat      , 2)
        MIPS_SYS(sys_dup2       , 2)
        MIPS_SYS(sys_getppid    , 0)
        MIPS_SYS(sys_getpgrp    , 0)    /* 4065 */
        MIPS_SYS(sys_setsid     , 0)
        MIPS_SYS(sys_sigaction  , 3)
        MIPS_SYS(sys_sgetmask   , 0)
        MIPS_SYS(sys_ssetmask   , 1)
        MIPS_SYS(sys_setreuid   , 2)    /* 4070 */
        MIPS_SYS(sys_setregid   , 2)
        MIPS_SYS(sys_sigsuspend , 0)
        MIPS_SYS(sys_sigpending , 1)
        MIPS_SYS(sys_sethostname        , 2)
        MIPS_SYS(sys_setrlimit  , 2)    /* 4075 */
        MIPS_SYS(sys_getrlimit  , 2)
        MIPS_SYS(sys_getrusage  , 2)
        MIPS_SYS(sys_gettimeofday, 2)
        MIPS_SYS(sys_settimeofday, 2)
        MIPS_SYS(sys_getgroups  , 2)    /* 4080 */
        MIPS_SYS(sys_setgroups  , 2)
        MIPS_SYS(sys_ni_syscall , 0)    /* old_select */
        MIPS_SYS(sys_symlink    , 2)
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_lstat */
        MIPS_SYS(sys_readlink   , 3)    /* 4085 */
        MIPS_SYS(sys_uselib     , 1)
        MIPS_SYS(sys_swapon     , 2)
        MIPS_SYS(sys_reboot     , 3)
        MIPS_SYS(old_readdir    , 3)
        MIPS_SYS(old_mmap       , 6)    /* 4090 */
        MIPS_SYS(sys_munmap     , 2)
        MIPS_SYS(sys_truncate   , 2)
        MIPS_SYS(sys_ftruncate  , 2)
        MIPS_SYS(sys_fchmod     , 2)
        MIPS_SYS(sys_fchown     , 3)    /* 4095 */
        MIPS_SYS(sys_getpriority        , 2)
        MIPS_SYS(sys_setpriority        , 3)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_statfs     , 2)
        MIPS_SYS(sys_fstatfs    , 2)    /* 4100 */
        MIPS_SYS(sys_ni_syscall , 0)    /* was ioperm(2) */
        MIPS_SYS(sys_socketcall , 2)
        MIPS_SYS(sys_syslog     , 3)
        MIPS_SYS(sys_setitimer  , 3)
        MIPS_SYS(sys_getitimer  , 2)    /* 4105 */
        MIPS_SYS(sys_newstat    , 2)
        MIPS_SYS(sys_newlstat   , 2)
        MIPS_SYS(sys_newfstat   , 2)
        MIPS_SYS(sys_uname      , 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* 4110 was iopl(2) */
        MIPS_SYS(sys_vhangup    , 0)
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_idle() */
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_vm86 */
        MIPS_SYS(sys_wait4      , 4)
        MIPS_SYS(sys_swapoff    , 1)    /* 4115 */
        MIPS_SYS(sys_sysinfo    , 1)
        MIPS_SYS(sys_ipc                , 6)
        MIPS_SYS(sys_fsync      , 1)
        MIPS_SYS(sys_sigreturn  , 0)
        MIPS_SYS(sys_clone      , 6)    /* 4120 */
        MIPS_SYS(sys_setdomainname, 2)
        MIPS_SYS(sys_newuname   , 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* sys_modify_ldt */
        MIPS_SYS(sys_adjtimex   , 1)
        MIPS_SYS(sys_mprotect   , 3)    /* 4125 */
        MIPS_SYS(sys_sigprocmask        , 3)
        MIPS_SYS(sys_ni_syscall , 0)    /* was create_module */
        MIPS_SYS(sys_init_module        , 5)
        MIPS_SYS(sys_delete_module, 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* 4130 was get_kernel_syms */
        MIPS_SYS(sys_quotactl   , 0)
        MIPS_SYS(sys_getpgid    , 1)
        MIPS_SYS(sys_fchdir     , 1)
        MIPS_SYS(sys_bdflush    , 2)
        MIPS_SYS(sys_sysfs      , 3)    /* 4135 */
        MIPS_SYS(sys_personality        , 1)
        MIPS_SYS(sys_ni_syscall , 0)    /* for afs_syscall */
        MIPS_SYS(sys_setfsuid   , 1)
        MIPS_SYS(sys_setfsgid   , 1)
        MIPS_SYS(sys_llseek     , 5)    /* 4140 */
        MIPS_SYS(sys_getdents   , 3)
        MIPS_SYS(sys_select     , 5)
        MIPS_SYS(sys_flock      , 2)
        MIPS_SYS(sys_msync      , 3)
        MIPS_SYS(sys_readv      , 3)    /* 4145 */
        MIPS_SYS(sys_writev     , 3)
        MIPS_SYS(sys_cacheflush , 3)
        MIPS_SYS(sys_cachectl   , 3)
        MIPS_SYS(sys_sysmips    , 4)
        MIPS_SYS(sys_ni_syscall , 0)    /* 4150 */
        MIPS_SYS(sys_getsid     , 1)
        MIPS_SYS(sys_fdatasync  , 0)
        MIPS_SYS(sys_sysctl     , 1)
        MIPS_SYS(sys_mlock      , 2)
        MIPS_SYS(sys_munlock    , 2)    /* 4155 */
        MIPS_SYS(sys_mlockall   , 1)
        MIPS_SYS(sys_munlockall , 0)
        MIPS_SYS(sys_sched_setparam, 2)
        MIPS_SYS(sys_sched_getparam, 2)
        MIPS_SYS(sys_sched_setscheduler, 3)     /* 4160 */
        MIPS_SYS(sys_sched_getscheduler, 1)
        MIPS_SYS(sys_sched_yield        , 0)
        MIPS_SYS(sys_sched_get_priority_max, 1)
        MIPS_SYS(sys_sched_get_priority_min, 1)
        MIPS_SYS(sys_sched_rr_get_interval, 2)  /* 4165 */
        MIPS_SYS(sys_nanosleep, 2)
        MIPS_SYS(sys_mremap     , 5)
        MIPS_SYS(sys_accept     , 3)
        MIPS_SYS(sys_bind       , 3)
        MIPS_SYS(sys_connect    , 3)    /* 4170 */
        MIPS_SYS(sys_getpeername        , 3)
        MIPS_SYS(sys_getsockname        , 3)
        MIPS_SYS(sys_getsockopt , 5)
        MIPS_SYS(sys_listen     , 2)
        MIPS_SYS(sys_recv       , 4)    /* 4175 */
        MIPS_SYS(sys_recvfrom   , 6)
        MIPS_SYS(sys_recvmsg    , 3)
        MIPS_SYS(sys_send       , 4)
        MIPS_SYS(sys_sendmsg    , 3)
        MIPS_SYS(sys_sendto     , 6)    /* 4180 */
        MIPS_SYS(sys_setsockopt , 5)
        MIPS_SYS(sys_shutdown   , 2)
        MIPS_SYS(sys_socket     , 3)
        MIPS_SYS(sys_socketpair , 4)
        MIPS_SYS(sys_setresuid  , 3)    /* 4185 */
        MIPS_SYS(sys_getresuid  , 3)
        MIPS_SYS(sys_ni_syscall , 0)    /* was sys_query_module */
        MIPS_SYS(sys_poll       , 3)
        MIPS_SYS(sys_nfsservctl , 3)
        MIPS_SYS(sys_setresgid  , 3)    /* 4190 */
        MIPS_SYS(sys_getresgid  , 3)
        MIPS_SYS(sys_prctl      , 5)
        MIPS_SYS(sys_rt_sigreturn, 0)
        MIPS_SYS(sys_rt_sigaction, 4)
        MIPS_SYS(sys_rt_sigprocmask, 4) /* 4195 */
        MIPS_SYS(sys_rt_sigpending, 2)
        MIPS_SYS(sys_rt_sigtimedwait, 4)
        MIPS_SYS(sys_rt_sigqueueinfo, 3)
        MIPS_SYS(sys_rt_sigsuspend, 0)
        MIPS_SYS(sys_pread64    , 6)    /* 4200 */
        MIPS_SYS(sys_pwrite64   , 6)
        MIPS_SYS(sys_chown      , 3)
        MIPS_SYS(sys_getcwd     , 2)
        MIPS_SYS(sys_capget     , 2)
        MIPS_SYS(sys_capset     , 2)    /* 4205 */
        MIPS_SYS(sys_sigaltstack        , 2)
        MIPS_SYS(sys_sendfile   , 4)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_mmap2      , 6)    /* 4210 */
        MIPS_SYS(sys_truncate64 , 4)
        MIPS_SYS(sys_ftruncate64        , 4)
        MIPS_SYS(sys_stat64     , 2)
        MIPS_SYS(sys_lstat64    , 2)
        MIPS_SYS(sys_fstat64    , 2)    /* 4215 */
        MIPS_SYS(sys_pivot_root , 2)
        MIPS_SYS(sys_mincore    , 3)
        MIPS_SYS(sys_madvise    , 3)
        MIPS_SYS(sys_getdents64 , 3)
        MIPS_SYS(sys_fcntl64    , 3)    /* 4220 */
        MIPS_SYS(sys_ni_syscall , 0)
        MIPS_SYS(sys_gettid     , 0)
        MIPS_SYS(sys_readahead  , 5)
        MIPS_SYS(sys_setxattr   , 5)
        MIPS_SYS(sys_lsetxattr  , 5)    /* 4225 */
        MIPS_SYS(sys_fsetxattr  , 5)
        MIPS_SYS(sys_getxattr   , 4)
        MIPS_SYS(sys_lgetxattr  , 4)

        MIPS_SYS(sys_fgetxattr  , 4)
        MIPS_SYS(sys_listxattr  , 3)    /* 4230 */
        MIPS_SYS(sys_llistxattr , 3)
        MIPS_SYS(sys_flistxattr , 3)
        MIPS_SYS(sys_removexattr        , 2)
        MIPS_SYS(sys_lremovexattr, 2)
        MIPS_SYS(sys_fremovexattr, 2)   /* 4235 */
        MIPS_SYS(sys_tkill      , 2)
        MIPS_SYS(sys_sendfile64 , 5)
        MIPS_SYS(sys_futex      , 6)
        MIPS_SYS(sys_sched_setaffinity, 3)
        MIPS_SYS(sys_sched_getaffinity, 3)      /* 4240 */
        MIPS_SYS(sys_io_setup   , 2)
        MIPS_SYS(sys_io_destroy , 1)
        MIPS_SYS(sys_io_getevents, 5)
        MIPS_SYS(sys_io_submit  , 3)
        MIPS_SYS(sys_io_cancel  , 3)    /* 4245 */
        MIPS_SYS(sys_exit_group , 1)
        MIPS_SYS(sys_lookup_dcookie, 3)
        MIPS_SYS(sys_epoll_create, 1)
        MIPS_SYS(sys_epoll_ctl  , 4)
        MIPS_SYS(sys_epoll_wait , 3)    /* 4250 */
        MIPS_SYS(sys_remap_file_pages, 5)
        MIPS_SYS(sys_set_tid_address, 1)
        MIPS_SYS(sys_restart_syscall, 0)
        MIPS_SYS(sys_fadvise64_64, 7)
        MIPS_SYS(sys_statfs64   , 3)    /* 4255 */
        MIPS_SYS(sys_fstatfs64  , 2)
        MIPS_SYS(sys_timer_create, 3)
        MIPS_SYS(sys_timer_settime, 4)
        MIPS_SYS(sys_timer_gettime, 2)
        MIPS_SYS(sys_timer_getoverrun, 1)       /* 4260 */
        MIPS_SYS(sys_timer_delete, 1)
        MIPS_SYS(sys_clock_settime, 2)
        MIPS_SYS(sys_clock_gettime, 2)
        MIPS_SYS(sys_clock_getres, 2)
        MIPS_SYS(sys_clock_nanosleep, 4)        /* 4265 */
        MIPS_SYS(sys_tgkill     , 3)
        MIPS_SYS(sys_utimes     , 2)
        MIPS_SYS(sys_mbind      , 4)
        MIPS_SYS(sys_ni_syscall , 0)    /* sys_get_mempolicy */
        MIPS_SYS(sys_ni_syscall , 0)    /* 4270 sys_set_mempolicy */
        MIPS_SYS(sys_mq_open    , 4)
        MIPS_SYS(sys_mq_unlink  , 1)
        MIPS_SYS(sys_mq_timedsend, 5)
        MIPS_SYS(sys_mq_timedreceive, 5)
        MIPS_SYS(sys_mq_notify  , 2)    /* 4275 */
        MIPS_SYS(sys_mq_getsetattr, 3)
        MIPS_SYS(sys_ni_syscall , 0)    /* sys_vserver */
        MIPS_SYS(sys_waitid     , 4)
        MIPS_SYS(sys_ni_syscall , 0)    /* available, was setaltroot */
        MIPS_SYS(sys_add_key    , 5)
        MIPS_SYS(sys_request_key, 4)
        MIPS_SYS(sys_keyctl     , 5)
        MIPS_SYS(sys_set_thread_area, 1)
        MIPS_SYS(sys_inotify_init, 0)
        MIPS_SYS(sys_inotify_add_watch, 3) /* 4285 */
        MIPS_SYS(sys_inotify_rm_watch, 2)
        MIPS_SYS(sys_migrate_pages, 4)
        MIPS_SYS(sys_openat, 4)
        MIPS_SYS(sys_mkdirat, 3)
        MIPS_SYS(sys_mknodat, 4)        /* 4290 */
        MIPS_SYS(sys_fchownat, 5)
        MIPS_SYS(sys_futimesat, 3)
        MIPS_SYS(sys_fstatat64, 4)
        MIPS_SYS(sys_unlinkat, 3)
        MIPS_SYS(sys_renameat, 4)       /* 4295 */
        MIPS_SYS(sys_linkat, 5)
        MIPS_SYS(sys_symlinkat, 3)
        MIPS_SYS(sys_readlinkat, 4)
        MIPS_SYS(sys_fchmodat, 3)
        MIPS_SYS(sys_faccessat, 3)      /* 4300 */
        MIPS_SYS(sys_pselect6, 6)
        MIPS_SYS(sys_ppoll, 5)
        MIPS_SYS(sys_unshare, 1)
        MIPS_SYS(sys_splice, 6)
        MIPS_SYS(sys_sync_file_range, 7) /* 4305 */
        MIPS_SYS(sys_tee, 4)
        MIPS_SYS(sys_vmsplice, 4)
        MIPS_SYS(sys_move_pages, 6)
        MIPS_SYS(sys_set_robust_list, 2)
        MIPS_SYS(sys_get_robust_list, 3) /* 4310 */
        MIPS_SYS(sys_kexec_load, 4)
        MIPS_SYS(sys_getcpu, 3)
        MIPS_SYS(sys_epoll_pwait, 6)
        MIPS_SYS(sys_ioprio_set, 3)
        MIPS_SYS(sys_ioprio_get, 2)
        MIPS_SYS(sys_utimensat, 4)
        MIPS_SYS(sys_signalfd, 3)
        MIPS_SYS(sys_ni_syscall, 0)     /* was timerfd */
        MIPS_SYS(sys_eventfd, 1)
        MIPS_SYS(sys_fallocate, 6)      /* 4320 */
        MIPS_SYS(sys_timerfd_create, 2)
        MIPS_SYS(sys_timerfd_gettime, 2)
        MIPS_SYS(sys_timerfd_settime, 4)
        MIPS_SYS(sys_signalfd4, 4)
        MIPS_SYS(sys_eventfd2, 2)       /* 4325 */
        MIPS_SYS(sys_epoll_create1, 1)
        MIPS_SYS(sys_dup3, 3)
        MIPS_SYS(sys_pipe2, 2)
        MIPS_SYS(sys_inotify_init1, 1)
        MIPS_SYS(sys_preadv, 5)         /* 4330 */
        MIPS_SYS(sys_pwritev, 5)
        MIPS_SYS(sys_rt_tgsigqueueinfo, 4)
        MIPS_SYS(sys_perf_event_open, 5)
        MIPS_SYS(sys_accept4, 4)
        MIPS_SYS(sys_recvmmsg, 5)       /* 4335 */
        MIPS_SYS(sys_fanotify_init, 2)
        MIPS_SYS(sys_fanotify_mark, 6)
        MIPS_SYS(sys_prlimit64, 4)
        MIPS_SYS(sys_name_to_handle_at, 5)
        MIPS_SYS(sys_open_by_handle_at, 3) /* 4340 */
        MIPS_SYS(sys_clock_adjtime, 2)
        MIPS_SYS(sys_syncfs, 1)
        MIPS_SYS(sys_sendmmsg, 4)
        MIPS_SYS(sys_setns, 2)
        MIPS_SYS(sys_process_vm_readv, 6) /* 345 */
        MIPS_SYS(sys_process_vm_writev, 6)
        MIPS_SYS(sys_kcmp, 5)
        MIPS_SYS(sys_finit_module, 3)
        MIPS_SYS(sys_sched_setattr, 2)
        MIPS_SYS(sys_sched_getattr, 3)  /* 350 */
        MIPS_SYS(sys_renameat2, 5)
        MIPS_SYS(sys_seccomp, 3)
        MIPS_SYS(sys_getrandom, 3)
        MIPS_SYS(sys_memfd_create, 2)
        MIPS_SYS(sys_bpf, 3)            /* 355 */
        MIPS_SYS(sys_execveat, 5)
        MIPS_SYS(sys_userfaultfd, 1)
        MIPS_SYS(sys_membarrier, 2)
        MIPS_SYS(sys_mlock2, 3)
        MIPS_SYS(sys_copy_file_range, 6) /* 360 */
        MIPS_SYS(sys_preadv2, 6)
        MIPS_SYS(sys_pwritev2, 6)
};
#  undef MIPS_SYS
# endif /* O32 */

static int do_store_exclusive(CPUMIPSState *env)
{
    target_ulong addr;
    target_ulong page_addr;
    target_ulong val;
    int flags;
    int segv = 0;
    int reg;
    int d;

    addr = env->lladdr;
    page_addr = addr & TARGET_PAGE_MASK;
    start_exclusive();
    mmap_lock();
    flags = page_get_flags(page_addr);
    if ((flags & PAGE_READ) == 0) {
        segv = 1;
    } else {
        reg = env->llreg & 0x1f;
        d = (env->llreg & 0x20) != 0;
        if (d) {
            segv = get_user_s64(val, addr);
        } else {
            segv = get_user_s32(val, addr);
        }
        if (!segv) {
            if (val != env->llval) {
                env->active_tc.gpr[reg] = 0;
            } else {
                if (d) {
                    segv = put_user_u64(env->llnewval, addr);
                } else {
                    segv = put_user_u32(env->llnewval, addr);
                }
                if (!segv) {
                    env->active_tc.gpr[reg] = 1;
                }
            }
        }
    }
    env->lladdr = -1;
    if (!segv) {
        env->active_tc.PC += 4;
    }
    mmap_unlock();
    end_exclusive();
    return segv;
}

/* Break codes */
enum {
    BRK_OVERFLOW = 6,
    BRK_DIVZERO = 7
};

static int do_break(CPUMIPSState *env, target_siginfo_t *info,
                    unsigned int code)
{
    int ret = -1;

    switch (code) {
    case BRK_OVERFLOW:
    case BRK_DIVZERO:
        info->si_signo = TARGET_SIGFPE;
        info->si_errno = 0;
        info->si_code = (code == BRK_OVERFLOW) ? FPE_INTOVF : FPE_INTDIV;
        queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
        ret = 0;
        break;
    default:
        info->si_signo = TARGET_SIGTRAP;
        info->si_errno = 0;
        queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
        ret = 0;
        break;
    }

    return ret;
}

void cpu_loop(CPUMIPSState *env)
{
    CPUState *cs = CPU(mips_env_get_cpu(env));
    target_siginfo_t info;
    int trapnr;
    abi_long ret;
# ifdef TARGET_ABI_MIPSO32
    unsigned int syscall_num;
# endif

    for(;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch(trapnr) {
        case EXCP_SYSCALL:
            env->active_tc.PC += 4;
# ifdef TARGET_ABI_MIPSO32
            syscall_num = env->active_tc.gpr[2] - 4000;
            if (syscall_num >= sizeof(mips_syscall_args)) {
                ret = -TARGET_ENOSYS;
            } else {
                int nb_args;
                abi_ulong sp_reg;
                abi_ulong arg5 = 0, arg6 = 0, arg7 = 0, arg8 = 0;

                nb_args = mips_syscall_args[syscall_num];
                sp_reg = env->active_tc.gpr[29];
                switch (nb_args) {
                /* these arguments are taken from the stack */
                case 8:
                    if ((ret = get_user_ual(arg8, sp_reg + 28)) != 0) {
                        goto done_syscall;
                    }
                case 7:
                    if ((ret = get_user_ual(arg7, sp_reg + 24)) != 0) {
                        goto done_syscall;
                    }
                case 6:
                    if ((ret = get_user_ual(arg6, sp_reg + 20)) != 0) {
                        goto done_syscall;
                    }
                case 5:
                    if ((ret = get_user_ual(arg5, sp_reg + 16)) != 0) {
                        goto done_syscall;
                    }
                default:
                    break;
                }
                ret = do_syscall(env, env->active_tc.gpr[2],
                                 env->active_tc.gpr[4],
                                 env->active_tc.gpr[5],
                                 env->active_tc.gpr[6],
                                 env->active_tc.gpr[7],
                                 arg5, arg6, arg7, arg8);
            }
done_syscall:
# else
            ret = do_syscall(env, env->active_tc.gpr[2],
                             env->active_tc.gpr[4], env->active_tc.gpr[5],
                             env->active_tc.gpr[6], env->active_tc.gpr[7],
                             env->active_tc.gpr[8], env->active_tc.gpr[9],
                             env->active_tc.gpr[10], env->active_tc.gpr[11]);
# endif /* O32 */
            if (ret == -TARGET_ERESTARTSYS) {
                env->active_tc.PC -= 4;
                break;
            }
            if (ret == -TARGET_QEMU_ESIGRETURN) {
                /* Returning from a successful sigreturn syscall.
                   Avoid clobbering register state.  */
                break;
            }
            if ((abi_ulong)ret >= (abi_ulong)-1133) {
                env->active_tc.gpr[7] = 1; /* error flag */
                ret = -ret;
            } else {
                env->active_tc.gpr[7] = 0; /* error flag */
            }
            env->active_tc.gpr[2] = ret;
            break;
        case EXCP_TLBL:
        case EXCP_TLBS:
        case EXCP_AdEL:
        case EXCP_AdES:
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            /* XXX: check env->error_code */
            info.si_code = TARGET_SEGV_MAPERR;
            info._sifields._sigfault._addr = env->CP0_BadVAddr;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_CpU:
        case EXCP_RI:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = 0;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_SC:
            if (do_store_exclusive(env)) {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->active_tc.PC;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_DSPDIS:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPC;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        /* The code below was inspired by the MIPS Linux kernel trap
         * handling code in arch/mips/kernel/traps.c.
         */
        case EXCP_BREAK:
            {
                abi_ulong trap_instr;
                unsigned int code;

                if (env->hflags & MIPS_HFLAG_M16) {
                    if (env->insn_flags & ASE_MICROMIPS) {
                        /* microMIPS mode */
                        ret = get_user_u16(trap_instr, env->active_tc.PC);
                        if (ret != 0) {
                            goto error;
                        }

                        if ((trap_instr >> 10) == 0x11) {
                            /* 16-bit instruction */
                            code = trap_instr & 0xf;
                        } else {
                            /* 32-bit instruction */
                            abi_ulong instr_lo;

                            ret = get_user_u16(instr_lo,
                                               env->active_tc.PC + 2);
                            if (ret != 0) {
                                goto error;
                            }
                            trap_instr = (trap_instr << 16) | instr_lo;
                            code = ((trap_instr >> 6) & ((1 << 20) - 1));
                            /* Unfortunately, microMIPS also suffers from
                               the old assembler bug...  */
                            if (code >= (1 << 10)) {
                                code >>= 10;
                            }
                        }
                    } else {
                        /* MIPS16e mode */
                        ret = get_user_u16(trap_instr, env->active_tc.PC);
                        if (ret != 0) {
                            goto error;
                        }
                        code = (trap_instr >> 6) & 0x3f;
                    }
                } else {
                    ret = get_user_u32(trap_instr, env->active_tc.PC);
                    if (ret != 0) {
                        goto error;
                    }

                    /* As described in the original Linux kernel code, the
                     * below checks on 'code' are to work around an old
                     * assembly bug.
                     */
                    code = ((trap_instr >> 6) & ((1 << 20) - 1));
                    if (code >= (1 << 10)) {
                        code >>= 10;
                    }
                }

                if (do_break(env, &info, code) != 0) {
                    goto error;
                }
            }
            break;
        case EXCP_TRAP:
            {
                abi_ulong trap_instr;
                unsigned int code = 0;

                if (env->hflags & MIPS_HFLAG_M16) {
                    /* microMIPS mode */
                    abi_ulong instr[2];

                    ret = get_user_u16(instr[0], env->active_tc.PC) ||
                          get_user_u16(instr[1], env->active_tc.PC + 2);

                    trap_instr = (instr[0] << 16) | instr[1];
                } else {
                    ret = get_user_u32(trap_instr, env->active_tc.PC);
                }

                if (ret != 0) {
                    goto error;
                }

                /* The immediate versions don't provide a code.  */
                if (!(trap_instr & 0xFC000000)) {
                    if (env->hflags & MIPS_HFLAG_M16) {
                        /* microMIPS mode */
                        code = ((trap_instr >> 12) & ((1 << 4) - 1));
                    } else {
                        code = ((trap_instr >> 6) & ((1 << 10) - 1));
                    }
                }

                if (do_break(env, &info, code) != 0) {
                    goto error;
                }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
error:
            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_OPENRISC

void cpu_loop(CPUOpenRISCState *env)
{
    CPUState *cs = CPU(openrisc_env_get_cpu(env));
    int trapnr, gdbsig;
    abi_long ret;

    for (;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);
        gdbsig = 0;

        switch (trapnr) {
        case EXCP_RESET:
            qemu_log_mask(CPU_LOG_INT, "\nReset request, exit, pc is %#x\n", env->pc);
            exit(EXIT_FAILURE);
            break;
        case EXCP_BUSERR:
            qemu_log_mask(CPU_LOG_INT, "\nBus error, exit, pc is %#x\n", env->pc);
            gdbsig = TARGET_SIGBUS;
            break;
        case EXCP_DPF:
        case EXCP_IPF:
            cpu_dump_state(cs, stderr, fprintf, 0);
            gdbsig = TARGET_SIGSEGV;
            break;
        case EXCP_TICK:
            qemu_log_mask(CPU_LOG_INT, "\nTick time interrupt pc is %#x\n", env->pc);
            break;
        case EXCP_ALIGN:
            qemu_log_mask(CPU_LOG_INT, "\nAlignment pc is %#x\n", env->pc);
            gdbsig = TARGET_SIGBUS;
            break;
        case EXCP_ILLEGAL:
            qemu_log_mask(CPU_LOG_INT, "\nIllegal instructionpc is %#x\n", env->pc);
            gdbsig = TARGET_SIGILL;
            break;
        case EXCP_INT:
            qemu_log_mask(CPU_LOG_INT, "\nExternal interruptpc is %#x\n", env->pc);
            break;
        case EXCP_DTLBMISS:
        case EXCP_ITLBMISS:
            qemu_log_mask(CPU_LOG_INT, "\nTLB miss\n");
            break;
        case EXCP_RANGE:
            qemu_log_mask(CPU_LOG_INT, "\nRange\n");
            gdbsig = TARGET_SIGSEGV;
            break;
        case EXCP_SYSCALL:
            env->pc += 4;   /* 0xc00; */
            ret = do_syscall(env,
                             env->gpr[11], /* return value       */
                             env->gpr[3],  /* r3 - r7 are params */
                             env->gpr[4],
                             env->gpr[5],
                             env->gpr[6],
                             env->gpr[7],
                             env->gpr[8], 0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->pc -= 4;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->gpr[11] = ret;
            }
            break;
        case EXCP_FPE:
            qemu_log_mask(CPU_LOG_INT, "\nFloating point error\n");
            break;
        case EXCP_TRAP:
            qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
            gdbsig = TARGET_SIGTRAP;
            break;
        case EXCP_NR:
            qemu_log_mask(CPU_LOG_INT, "\nNR\n");
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
                     trapnr);
            gdbsig = TARGET_SIGILL;
            break;
        }
        if (gdbsig) {
            gdb_handlesig(cs, gdbsig);
            if (gdbsig != TARGET_SIGTRAP) {
                exit(EXIT_FAILURE);
            }
        }

        process_pending_signals(env);
    }
}

#endif /* TARGET_OPENRISC */

#ifdef TARGET_SH4
void cpu_loop(CPUSH4State *env)
{
    CPUState *cs = CPU(sh_env_get_cpu(env));
    int trapnr, ret;
    target_siginfo_t info;

    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case 0x160:
            env->pc += 2;
            ret = do_syscall(env,
                             env->gregs[3],
                             env->gregs[4],
                             env->gregs[5],
                             env->gregs[6],
                             env->gregs[7],
                             env->gregs[0],
                             env->gregs[1],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->pc -= 2;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->gregs[0] = ret;
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case 0xa0:
        case 0xc0:
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            info.si_code = TARGET_SEGV_MAPERR;
            info._sifields._sigfault._addr = env->tea;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;

        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, fprintf, 0);
            exit(EXIT_FAILURE);
        }
        process_pending_signals (env);
    }
}
#endif

#ifdef TARGET_CRIS
void cpu_loop(CPUCRISState *env)
{
    CPUState *cs = CPU(cris_env_get_cpu(env));
    int trapnr, ret;
    target_siginfo_t info;
    
    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case 0xaa:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->pregs[PR_EDA];
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_INTERRUPT:
          /* just indicate that signals should be handled asap */
          break;
        case EXCP_BREAK:
            ret = do_syscall(env, 
                             env->regs[9], 
                             env->regs[10], 
                             env->regs[11], 
                             env->regs[12], 
                             env->regs[13], 
                             env->pregs[7], 
                             env->pregs[11],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->pc -= 2;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->regs[10] = ret;
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, fprintf, 0);
            exit(EXIT_FAILURE);
        }
        process_pending_signals (env);
    }
}
#endif

#ifdef TARGET_MICROBLAZE
void cpu_loop(CPUMBState *env)
{
    CPUState *cs = CPU(mb_env_get_cpu(env));
    int trapnr, ret;
    target_siginfo_t info;
    
    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case 0xaa:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = 0;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_INTERRUPT:
          /* just indicate that signals should be handled asap */
          break;
        case EXCP_BREAK:
            /* Return address is 4 bytes after the call.  */
            env->regs[14] += 4;
            env->sregs[SR_PC] = env->regs[14];
            ret = do_syscall(env, 
                             env->regs[12], 
                             env->regs[5], 
                             env->regs[6], 
                             env->regs[7], 
                             env->regs[8], 
                             env->regs[9], 
                             env->regs[10],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                /* Wind back to before the syscall. */
                env->sregs[SR_PC] -= 4;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->regs[3] = ret;
            }
            /* All syscall exits result in guest r14 being equal to the
             * PC we return to, because the kernel syscall exit "rtbd" does
             * this. (This is true even for sigreturn(); note that r14 is
             * not a userspace-usable register, as the kernel may clobber it
             * at any point.)
             */
            env->regs[14] = env->sregs[SR_PC];
            break;
        case EXCP_HW_EXCP:
            env->regs[17] = env->sregs[SR_PC] + 4;
            if (env->iflags & D_FLAG) {
                env->sregs[SR_ESR] |= 1 << 12;
                env->sregs[SR_PC] -= 4;
                /* FIXME: if branch was immed, replay the imm as well.  */
            }

            env->iflags &= ~(IMM_FLAG | D_FLAG);

            switch (env->sregs[SR_ESR] & 31) {
                case ESR_EC_DIVZERO:
                    info.si_signo = TARGET_SIGFPE;
                    info.si_errno = 0;
                    info.si_code = TARGET_FPE_FLTDIV;
                    info._sifields._sigfault._addr = 0;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                    break;
                case ESR_EC_FPU:
                    info.si_signo = TARGET_SIGFPE;
                    info.si_errno = 0;
                    if (env->sregs[SR_FSR] & FSR_IO) {
                        info.si_code = TARGET_FPE_FLTINV;
                    }
                    if (env->sregs[SR_FSR] & FSR_DZ) {
                        info.si_code = TARGET_FPE_FLTDIV;
                    }
                    info._sifields._sigfault._addr = 0;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                    break;
                default:
                    printf ("Unhandled hw-exception: 0x%x\n",
                            env->sregs[SR_ESR] & ESR_EC_MASK);
                    cpu_dump_state(cs, stderr, fprintf, 0);
                    exit(EXIT_FAILURE);
                    break;
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, fprintf, 0);
            exit(EXIT_FAILURE);
        }
        process_pending_signals (env);
    }
}
#endif

#ifdef TARGET_M68K

void cpu_loop(CPUM68KState *env)
{
    CPUState *cs = CPU(m68k_env_get_cpu(env));
    int trapnr;
    unsigned int n;
    target_siginfo_t info;
    TaskState *ts = cs->opaque;

    for(;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch(trapnr) {
        case EXCP_ILLEGAL:
            {
                if (ts->sim_syscalls) {
                    uint16_t nr;
                    get_user_u16(nr, env->pc + 2);
                    env->pc += 4;
                    do_m68k_simcall(env, nr);
                } else {
                    goto do_sigill;
                }
            }
            break;
        case EXCP_HALT_INSN:
            /* Semihosing syscall.  */
            env->pc += 4;
            do_m68k_semihosting(env, env->dregs[0]);
            break;
        case EXCP_LINEA:
        case EXCP_LINEF:
        case EXCP_UNSUPPORTED:
        do_sigill:
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPN;
            info._sifields._sigfault._addr = env->pc;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_TRAP0:
            {
                abi_long ret;
                ts->sim_syscalls = 0;
                n = env->dregs[0];
                env->pc += 2;
                ret = do_syscall(env,
                                 n,
                                 env->dregs[1],
                                 env->dregs[2],
                                 env->dregs[3],
                                 env->dregs[4],
                                 env->dregs[5],
                                 env->aregs[0],
                                 0, 0);
                if (ret == -TARGET_ERESTARTSYS) {
                    env->pc -= 2;
                } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                    env->dregs[0] = ret;
                }
            }
            break;
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_ACCESS:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->mmu.ar;
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif /* TARGET_M68K */

#ifdef TARGET_ALPHA
void cpu_loop(CPUAlphaState *env)
{
    CPUState *cs = CPU(alpha_env_get_cpu(env));
    int trapnr;
    target_siginfo_t info;
    abi_long sysret;

    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        /* All of the traps imply a transition through PALcode, which
           implies an REI instruction has been executed.  Which means
           that the intr_flag should be cleared.  */
        env->intr_flag = 0;

        switch (trapnr) {
        case EXCP_RESET:
            fprintf(stderr, "Reset requested. Exit\n");
            exit(EXIT_FAILURE);
            break;
        case EXCP_MCHK:
            fprintf(stderr, "Machine check exception. Exit\n");
            exit(EXIT_FAILURE);
            break;
        case EXCP_SMP_INTERRUPT:
        case EXCP_CLK_INTERRUPT:
        case EXCP_DEV_INTERRUPT:
            fprintf(stderr, "External interrupt. Exit\n");
            exit(EXIT_FAILURE);
            break;
        case EXCP_MMFAULT:
            env->lock_addr = -1;
            info.si_signo = TARGET_SIGSEGV;
            info.si_errno = 0;
            info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID
                            ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR);
            info._sifields._sigfault._addr = env->trap_arg0;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_UNALIGN:
            env->lock_addr = -1;
            info.si_signo = TARGET_SIGBUS;
            info.si_errno = 0;
            info.si_code = TARGET_BUS_ADRALN;
            info._sifields._sigfault._addr = env->trap_arg0;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_OPCDEC:
        do_sigill:
            env->lock_addr = -1;
            info.si_signo = TARGET_SIGILL;
            info.si_errno = 0;
            info.si_code = TARGET_ILL_ILLOPC;
            info._sifields._sigfault._addr = env->pc;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_ARITH:
            env->lock_addr = -1;
            info.si_signo = TARGET_SIGFPE;
            info.si_errno = 0;
            info.si_code = TARGET_FPE_FLTINV;
            info._sifields._sigfault._addr = env->pc;
            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            break;
        case EXCP_FEN:
            /* No-op.  Linux simply re-enables the FPU.  */
            break;
        case EXCP_CALL_PAL: